particular, peculiar, special - unique or specific to a person or thing or category
Example:- the particular demands of the job
peculiar - markedly different from the usual
Example:- a peculiar hobby of stuffing and mounting bats
peculiar - characteristic of one only; distinctive or special
Example:- the peculiar character of the Government of the U.S.
curious, funny, odd, peculiar, queer, rum, rummy, singular - beyond or deviating from the usual or expected
Example:- a curious hybrid accent